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G. A. SQUIER. MACHINE FOR TRUING GRINDING DISKS. APPLICATION man MAR.25. |918.

Patented July 8, 1919.

2 SHEETS-SHEET l.

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G. A. SQUIER. MACHINE FOR TRUING GRENDING DISKS.

APPLICATION FILED MAR. 25| I9I8.

lzlented July 8, 1910.

2 SHEETS-SHEET 2.

a n vente@ Clltozncag UNITED STATES PATENT OFFICE.

GEORGE A. SQUER, 0E' CLEVELAND, OHIO.

MACHINE FOR TRUING GRINDING-DSKS.

To (1li 'whom it may com/cm Beeit known that 1, (iioiion A. SQUIER,citizen of the United States, residing at Cleveland, in the county ofCuyahoga and State of Ohio, have invented certain new and usefulimprovements in Machines for Truiug Grinding-Disks, of which thefollowing is a specification.

rlhs invention relates to a machine for `truing grinding disks, and themachine is particularly constructed to produce either.

a concave or convex surface having a curvature of different radius inone plane than .in another plane at right angles thereto, and means arealso provided to adj ustably position the work and the cutting toolrelatively to each other and to given axes of rotation so that a curvedsurface of any desired radius may be produced in either of the twoplanes of curvature in the grinding disk.

rThe grinding disks used for grinding lenses for spectacles and eyeglasses vary greatly in formation and are of great num: ber, and thewholesale and retail optical establishments purchasing and using suchdisks have no accurate and satisfactory way of regrinding the curvedsurfaces thereof after the loss of their exactness of curvature causedby the employment of the abrasive used in grinding the lenses. As aresult under present conditions, thousands of lenses are groundimperfectly because of the inability of optical establishments toregrind and true the grinding disks to the exactness required. rlheobject of my invention is to overcome the conditions aforesaid andprovide a simple and inexpensive machine adapted to be used by lensgrinders to restore worn grinding disks to their original truecurvature, regardless of the radius of curvature of any given disk orthe difference in radii of two curved surfaces in different planes inany given grinding disk.

ln the accompanying drawings, Figure 1 is a vertical sectionlongitudinally through the center of the machine, and Fig. 2 is a, topplan of Fig. 1, and in b-oth figures the cutting tool is shown supportedto swing in a horizontal plane and the grinding disk is of convex formand supported to rotate in a. vertical plane. Fig. 3 is a side view ofthe machine, with the cutting tool supported to rotate in a verticalplane and with a concaved grinding disk supported. to swing inSpecification of Letters Patent.

Application led March 25, 1918.

Patented J uly 8, 1919.

Serial No. 224,668.

a horizontal plane opposite the tool. Fig. 4 is a transverse section online lf-l, of Fig. 1, and Fig. 5 is a plan view and section showing theturn-plate and worm gearing for producing a movement in a horizontalplane of the tool or work carried in and by the post on the turn-plate.Fig. 6 is an end view of the flat-sided shank used for the tool and alsothe Work-holder,

rlhe machine comprises a table or base 2 supported on suitaible legs 3,and one end portion of this table is relatively narrow and elongated andprovided with a slot 4 and a dove-tailed channel 5 loiigitudinallythereof, while the other end of the table is in the form of an open ring6 having a level surface at its top lying in a lower plane than theupperflat surface of the main body of the table. A slotted bar orturn-plate 7 rests upon ring (l and turns on a pivot 8 located midway onthe longitudinal median line of the table. Turning of the plate isaccomplished by a Worm pinion 10 meshing with gear teeth 9 on therounded edge of the plate, and this pinion is mounted on a rotatableshaft 11 extending transversely through the table. An intermittentrotation of the shaft is obtained by a ratchet wheel 12, a ratchet boltor dog 13 carried on an arm 14 free to oscillate on shaft 11, and by atelescopic link 15 connecting said arm with an eccentric or crank pin 1Gadjustably fixed in a disk 17 on one end of a shaft 18 rotatably mountedin a pair of upright arms 19 forming part of a slide 20 which is seatedin the dove-tailed channel 5 of table 2. Shaft 18 carries a gear 21 inmesh with a pinion 22 driven by an electric motor 23 which rests on aside bracket 24 also forming part of slide 2O and therefore movablethere-With, and for convenience of shifting and setting 1 employ a handscrew 25 in swiveled connection with the slide. A hand screw 26 is alsoused to fasten the slide after a fine adjustment has been obtained byscrew 25, and it should be noted that the adjustment of the slide is ina direct line with the pivot S for the turn-plate 7, and that the latteralso supports a slide 27 carrying a tool post or workholder. Slide 27 isseated on the turn-plate and has a straight rib 28 at its bottomoperating in a slot 29 extending lengthwise of the turn-plate, and alongitudinal movement and a fine adjustment of holder 27 is obtained bya. hand screw 30 in swiveled connection with said slide. A hand screw 31fixes the slide on its seat after adjustments, and the open space withinthe ring 6 affords all the clearance necessary for the set screw in itsmovement with the turn-table.

The post or standard on slide 27 has a screw-threaded opening 32 in itsupper end lying in the same plane and coincident with the axis of ascrew-threaded opening 33 extending crosswise through the rotatableshaft 18 carried by the first slide 20, and either one of these openingsmay be utilized to scat a cutting tool 34 therein or A thescrew-threaded stem 35 of a simple form of holder or chuck for agrinding disk 3G which may possess either a convex grinding surface 37as shown in Fig. 1 or a concave grinding surface 38 as disclosed in Fig.3.

In truing a convex disk the cutting tool 34 is secured in the holder 27and the disk is affixed to the holder or chuck stem 35 secured in shaft18. Then the disk-holding stem is rotated in its threaded seat in theshaft until the convex surface of the disk is placed at a predetermineddistance from the shaft axis, this distance being measured lby asuitable gage, see dotted lines, Fig. 2. The position of the diskrelatively to the shaft ,axis determines the radius of curvature to begiven to the grinding surface of the disk measured in the plane ofrotation of the stem and disk, allowance being made for the depth of cutby the tool. The depth of cut may be fixed definitely by shifting slide20 relatively to the tool, all without changing the radius of cut. Butthe curvature of the grinding surface transversely of the disk is of anentirely different radius than the curved surface longitudinally of thedisk, excepting when the grinding surface is spherical. Consequentlythere must also be a common adjustment of both slides 2O and 27relatively to the pivot 8 of the turn-plate 7 so that the cutting toolwill traverse an arc at its cutting point corresponding exactly to thecurvature desired or to be given to the grinding surface of the disktransversely thereof. By setting the tool holder or slide 27 or the tool34 nearer pivot 8 the tool point will describe an arc of smaller radiusthan Where said parts are placed farther from said pivot, in this waycutting or truing the grinding surface to any desired radius ofcurvature within the limits of the machine, regardless of the differencein the radius of curvature of the grinding surface longitudinally of thedisk.

In grinding a concaved disk it is only necessary to transpose orexchange the respective positions of the tool and disk holder, androtate the tool in one plane While moving the disk at intermittentintervals in another plane at right angles and in an arc having pivot 8as the axis of movement. Thls settlng of parts is shown in Fig. 3, and

the respective slides supporting the tool and disk holding parts may beplaced different distances from each other and from ,pivot 8, and thecutting tool may he adjusted radially inward or outward relatively tothe axis of shaft 18, whereby the truing of the concaved surface of anygrinding disk, having differences in radii transversely andlongitudinally of the disk, may be accurately and efficiently performed.

The slides may be fed or adjustably shifted by any suitable means otherthan the screws 25 and 30, and gage marks 38 may be provided on theturn-plate and other parts to determine an accurate setting of theslides for truing any given grinding disk. A crank handle 39 may also beused to rotate gear-shaft 10 independently of the ratchet mechanism, andthe threaded stems of tool 34 and the chuck or holder 35 may beflattened at one or more places and screws 40 and 41 used oppositethereto to lock .them in any desired adjusted position.

What I claim is:

1. In a machine for producing curved surfaces of different radii indifferent planes, separate supporting devices for the cutting tool andthe work mounted to rotate and turn in separate planes at right anglesto each other and each adjustable relatively toward and away from eachother and the axis of turning movement of one of said devices.

2. A machine for producing curved surfaces of different radii at rightangles relatively to each other comprising a cutting tool, means torevolve said tool repeatedly in a circular path, an adjustable supportfor said means, a work-holder adj ustably mounted opposite said tool andmeans to move said work-holder in a circular path lying in a plane atright angles to the plane of circular movement of said tool.

3. A machine for truing grinding disks comprising means to rotate eithera cutting tool or. a grinding disk in one plane of rotation, anadjustable support for said means, means to carry either a cutting toolor a grinding disk in a circular path in another plane lying at rightangles to said first plane, and each of said means being capable ofadjustment relatively toward and away from the other means.

4. A machine for truing grinding disks comprising means for holding androtating either a cutting tool or a grinding disk about a horizontalaxis and adjustably at variable distances therefrom, in combination withmeans for holding and turning either a cutting tool or a grinding diskabout a vertical pivot and adjustably at variable distances therefrom.

5. A machine for truing grinding disks, comprising separate slides eachadjustably positioned in respect to the other, means on one slideadapted to rotate either a cutting tool or a grinding disk continuously,and means to impart an arc movement to said other slide opposite saidrotating means.

(5. A machine for truing grinding disks, comprisiine,V a slide and arotatable shaft carried thereby, a pivoted plate and a slide mountedthereon. and separate means ad jnstably mounted on said shaft and lastnamed slide for holding a cutting tool and grinding disk in operatingrelation at varying distances from the shaft.

T. A machine for truing grinding disks, comprising a shaft and means torotate the shaft, au adjustable support for said shaft and means, aturn-plate and an adjustable holder ou said plate, and means to secureeither a cutting tool or a grinding disk adjustably on either saidholder or shaft.

8. A machine for truing grinding disks, comprising a rotatable shaft anda turnplate and means to impart an intermittent movement to saidturn-plate during constant rotation of said shaft, said shaft andturn-plate being adjustable relatively to each other each having meansto adjust-ably support either a cutting tool or a grinding disk thereon.

t). A machine for trning grinding disks, comprising a rotatable holdingmeans and au adjustable support therefor, a second holding meansadjustably supported relative to said rotatable means and adapted toturn on a pivot and traverse a circular path opposite said rotatableholding means, and means to adjustably secure either a cutting tool or agrinding disk in either of said holding means.

10. machine for truing grinding disks, @Olnplisillg aI fable, a slideadjustably mounted on said table, a turn-plate pivoted on said tableopposite said slide, a second slide upon said turn-plate, a shaftcarried b v said first slide, means to rotate said shaft. mechanisluoperated by said shaft to actnate said turn-plate, and adjustable meanson said second slide and also the shaft to hold either a cutting tool ora grinding disk.

11. A machine for truing` grinding disks, comprising a table and a slidethereon carrying a motor and a rotatable shaft in gear with said motor,in combination with a turnplate and gear mechanism to turn said platehaving a take-up operating connection with said shaft.

Signed at. Cleveland, in the county of Cuyahoga and State. of (hio, this20th day of March, 1918.

GEGRGE A. SQUIER.

